Fashion's obsession with the sultry ladies of Mad Men has driven hemlines down to what might be called almost prudish lengths - if they weren't so sexy. The runways of all the fashion capitals were bustling with diligent secretaries going about their fashionable business. From Dries Van Noten and Fendi to Nina Ricci, there was a confident feeling of demure efficiency.

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Where does the sex appeal come from? By teaming skirts with bare legs and ladylike shoes to keep things fresh and youthful. Ankle socks, as seen at Marc Jacobs, are optional. For a darker, sexier look take inspiration from Prada and Celine by opting for a leather or PVC midi. At Louis Vuitton, corset tops added a boudoir flourish, while finely knitted pullovers at Celine made the most of curves.

Don't be fooled by the coy modesty of this look - this is one trend guaranteed to get office tongues wagging.